Photo Details

Photo detail

September 5, 2011

Flu shots have long been injected deep into muscle, requiring a needle an inch long or longer, such as the needle seen at left. However, a new version named Sanofi Pasteur's Fluzone Intradermal, hitting the market this fall, at right, is less than a tenth of an inch long. It's the first flu vaccine that works by injecting just into the skin.